Production of cyanamid.



i. grew are ra'aum sassisnu "JORTM or GERMANY TENT easiest BAYER, 6: 60., Or: iLBEZ'Z-F'ELD. GEEMANY l, Z1 p yanamid, or which the cation.

iates to an illklGYQZTi-Ekllt he isolation of cyanamid ie product which is produced by oi nitrogen upon carbid. v This limit consists of calcium cyanamid, humid and calciuui"carhid, tress for the isolation or cyanamourities and with a, good miiiture consists in separatinarnid in the shape of its lead to illustrate the new process more liowi'ng example is giVen:-1OO "ude product obtained from HCQGD are slowly introduced a 30. per cent. sulfuric acid" kilos of 1C8. When the real, e calcium sulfate and carbon ilo the filtered liquid e'hich' acid 100 liters of a 20 percent. ammo'np olution and 180 kilos of IPbCl (aqueous paste) are'added and the compound cyanarnid is filtered ofi.

Other l ad g. lead sulfate, lead sul .d etcl, and inste d of auiu oniaother allie me agents can he USGQ.

' We claim v I l. 'he process of isolating cyanamid iii'oni l i the reaction product or nitrogen upon calciurn caro'id which comprises treating the reac on product with an acid which forms ail-insoluble calcium compound, removing e -ial No. 680,342

such conipoundgand precipitating the cjan froin the" resulting solution by treati ith lead compound soluble in alkali solutions in the presence such alkali.

The process o1 isolating cyanamid frolii the reactionproduct of nitrogen upon calcium carhid which comprises treating such 'lreaction product with sulfuric acid, filtering, and precipitating the cyanamid from the re sulting filtrate in the form of its lead compound,'by treatment with a lead compound soluble in alkali solutions in the presence of lCll alkali. v

The process of isolatin C}"lilitll1ld from the reaction product of mt k upon calcium carbid which comprises treating such reaction product with sulfuric acid, filterin and precipitating the cyanamid mm the re- .sulting filtrate in the form of its lead coinpound by treatment with a lead salt soluble in amnioniacal solutions in he ,sence of such solutions- 7 +2. 1: he process of isolating the reaction product of hit cium carbid which comprises 1. u action product with an acid (321bl2 of: setting free-the cyanamirliuid ec 7 Hating the cyanamid from the g solution by treatment with a lead '31; ouucl soluble in vauaniid from sumo Witnesses HELEX Nun ALBERT l 

